Cooling fan cycling mazda 2 ZJ 1.3

Hallo,

My mazda 2 1.3 DE bifuel ( dutch version modified to LPG ) , Cooling fan cycles on and off every few seconds, even if the engine is Cold.
The thermostat works fine , the coolant temp. Switch is changed without effect.
According my research the on/off signal for the fan comes from the ECU. What could cause this false output?
 

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